Wide angle, retrofocus-type photo-taking lens

ABSTRACT

A wide angle, substantially distortion-free inverted telephototype photo-taking lens system comprises a forward divergent group, a forward convergent group preceding a diaphragm, and a rearward convergent group succeeding the diaphragm. Any one surface in the forward divergent group may be a non-spherical surface whose non-sphericity is within a predetermined range. The lens system satisfies a predetermined condition of the center thicknesses of lenses or the air spaces between lenses.

United State:

r iu/T time Takahashi Aug. 27, 1974 WIDE ANGLE, RETROFOCUS-TYPE [56] References Cited PHOTO-TAKING LENS UNITED STATES PATENTS [75} Invento Tomowa i Taknhnshi, Kawasaki, 3,037,426 6/1962 Hugues 350/214 x Japan 3,572,90l 3/1971 Mori 350/2l4 X [73 Assi nee: Ni K aku K.K. Tok 0, Ja an 1 g ppm 08 y p Primary Exarrdner-John K. Corbin [221 Fled: 1972 Attorney, Agent, or Firm-Fitzpatrick, Cella, Harper 21 Appl. No.: 232,172 & scmto 301 Foreign Application Priority Data [571 ABSTRACT Aug, 21, 1971 Japan 46-63366 A i e g u ally istortion-free inverted Oct. 30. 1971 Japan 46-86,634 telephoto-type photo-taking lens system comprises a Dec. 27, 1971 Japan 46-1264 forward divergent group, a forward convergent group Dec. 27. 1971, Japan 464265 preceding a di p r g n rear ard convergent Dec. 27. 1971 Japan 46-1266 group succeeding the diaphragm. Any one surface in Dec. 27. 1971 Japan 46-1267 he forward divergent group may be a non-spherical Dec. 27. 1971 Japan 46-1268 surface whose non-sphericity is within a predetermined range. The lens system satisfies a predeter- [52] US. Cl. 350/189, 359f-2-H mined condition of the center thicknesses of lenses or [51 Int. Cl. G02b 9/64 the air spaces between lenses. [58] Field of Search 350/189, 198, 214

18 Claims, 84 Drawing Figures PATENTEU 3.832.035

FIG. 2A FIG. 28 FIG. 2C

sPHEgc AL QRF A ASTIGMATISM DISTORTION 5o.oo 50.00

0.5 o o.s' -|'.o o 018 -4'/. o 4% FIG. 2D

COMA

PATENIEB 3.832.035

sum '03 or 19 FIG. 4B FIG.4C

---- LATERAL sPI-IERIcAL ABERRATION --COMA FOR INCIDENT ANGLE 3o COMA FOR INCIDENT ANGLE 45 COMA FOR INCIDENT ANGLE 50' U L2 FIG. 5

PATENIEDAUBZTIBH 3.832.035

SHEEY '0! G19 FIG. 6A FIG. 6B FIG.6C

COMA

mm FIG.6D

---- LATERAL SPHERICAL ABERRATION -COMA FOR INCIDENT ANGLE 30 ----COMA FOR INCIDENT ANGLE 45 ----COMA FOR INCIDENT ANGLE 50 PAIENTED 3.832.035

sum 01 or 19 FIG.9A FIG. 98 FIG. 9C

SPHERICAL P ASTIGMATISM DIST OR CONDITION I 35 50.00 I O Y I .75 4|.25

l V ----so.25 I I I T" '1 I I 0.5 O 0.5 O.8 O 0.8 -4% O 4% Q F IG. 9D

------ LATERAL SPHERICAL ABERRATION --COMA FOR INCIDENT ANGLE 30: -----COMA FOR INCIDENT ANGLE 45 --COMA FOR INCIDENT ANGLE 50 PATENTEM 3.832.035

9E3 09 I I9 FIG I PRIOR ART M Y JH J g, J PRIOR ART FI FIG. I2B F|G.l2C

SPHERICAL QR ASTIGMATISM DISTORTION CONDITION -O.5 O O.5 -O.8 O 0.8 -4% O 4% LATERAL SPHERICAL ABERRATION COMA ----COMA FOR INCIDENT ANGLE 30 0.02 mm ---COMA FOR INCIDENT ANGLE 45. --COMA FOR INCIDENT ANGLE so FIG. |2D

PATENIEII 3.832.035

am 10 w 19 mm FIG. l3

NON-SPHERICAL SURFACE FIG. I4A FIG. I4B FIG. I4C

SPHERICTAL E ASTIGMATISM DISTORTION CONDITION I735 V 50.00 -----50.oo

I I l I I I I I I I I -o.s o 0.5 -I.o' o IO -4%.0 4%

COMA LATERAL SPHERICAL ABERRATION o ogmm -COMA FOR INCIDENT ANGLE -----COMA FOR INCIDENT ANGLE ----COMA FOR INCIDENT ANGLE PATENTEU 3.832.035

SHEET 11 G 19 LILZLB FIG. l5

NON-SPHERICAL SURFACE FIG. I68 F|G.l6C

Qfi ASTIGMATISM DISTORTION CONDITION o 7 F/Z'I.5 M l 50 I 30 30 I l I l I l I O.5 O 0.5 O.8 O 0.8 --4 COMA LATERAL SPHERICAL ABERRATION -C0MA FOR INCIDENT ANGLE 30; 0.02 mm ---COMA FOR INCIDENT ANGLE 45 --CoMA FOR INCIDENT ANGLE 50 FIG. I6D

' PATENIEM 3.832.035

saw 12w I9 LI L2 FIG. I?

NON-SPHERICAL SURFACE g- [55 FIG. I8B FIG. |8C

QQF AsTIGMATIsM DISTORTION CONDITION c I I 45 45 i l 5 7, I 30 1 I I I I I I -0.5 o 0.5 -I.o o I.o 4% o 4% ---LATERAL SPHERICAL ABERRATION COMA c0MA FOR INCIDENT ANGLE 30 0 02mm ---coMA FOR INCIDENT ANGLE ---COMA FOR INCIDENT ANGLE A FIG. |8D

PATENTED 3.832.035

sum 1a or 19 FIG-l9A FIG.I9B F|G.I9C

SPHERICAL QRE ASTIGMATISM DISTORTION wmn g 0 I l 45 45 .4-:, 1 I o a i i 30 30 I l F 1 -o.5 o 0.5 |.o o Lo -49. 0 4% COMA 0.02 FIG. l9D

PATENIEBAUGZTIEIH SHEET 15W 19 FIG. 228

FIG. 22A

DISTORTION ASTIGMATISM 2.o -|.o o 0.5

BEFORE CORRECTION AFTER CORRECTION 0 5 w .0 m z 4 3 m M I. 1O. I M B m L a, 3 A A o N w/|\\ m 6 R 2 O 0 0 O 5 O 5 4 3 0 0 A w M E 3 n \\\I- O 2 R W m I z F D H w BEFORE CORRECTION AFTER CORRECTION PATENIIIIuc27I9II LI L2 L3 FIG. 24

LIOLIILI2 dI d2 d3 S2 SINON--SFHERICAL SURFACE 5 5 O N 5 4 3 m 4 T m 0 B D 4 O O O m M "w M m m B m T A W IIiIIIII \II 0 I m 9 m A M S O. N 5 M N m MT 0 IA I RR 0 ER D HE N PBI IO SASC E I5. w

- LATERAL SPHERICAL ABERRATION COMA FOR INCIDENT ANGLE ---coMA FOR INCIDENT ANGLE -coMA FOR INCIDENT ANGLE PATENIEU 3.832.035

sun 11 or 19 FIG. 26

d. d2 TJT I ID I s2 s3 NON SPHEFZICAL SURFACE FIG. 27A FIG. 275 FIG. 27C

SPHERICAL Q E AsTIGIvIATIsM DISTORTION CONDITION 55 55 7; /5.es MA o /a s-- 45 45 -o.s o 05 O.8 O 0.8 -4% 0 4% LATERAL SPHERICAL ABERRATION COMA CoMA FOR INCIDENT ANGLE 30 --COMA FOR INCIDENT ANGLE 45 002 --C0MA FOR INCIDENT ANGLE 55 FIG. 27D

* FIG. 28

L5 L6 L7 L8 L9 LIO Lll Ll2 d LI d; s

NON--SPHERICAL FIG. 29A FIG. 29B F|G.29C

SPHERICTAL QE ASTIGMATISM DISTORTION CONDITIOgSG -o.5 o 0.5 -I.o o I.o -4% o 4% ---LATERAL SPHERICAL ABERRATIQN COMA COMA FOR INcIoENT ANGLE 30 mm --coMA FOR INCIDENT ANGLE 45 -COMA FOR INCIDENT ANGLE 55 /l' bx FIG. 29D

PATENTEU 5 3.832.035

sIm 19 nr 19 QP E ASTIGMATISM DISTORTION CONDITION /3.5 I I c -45 /5.6 I -3o l O.5 O 0.5 l.O O LO 4% O 4% coNIA FIG. 3|D

---- LATERAL SPHERICAL ABERRATLON COMA FOR INCIDENT ANGLE 30 -----coIvIA FOR INCIDENT ANGLE 45 --COMA FOR INCIDENT ANGLE 55 

1. In a wide angle, substantially distortion free, inverted telephoto lens system consisting of a front diverging lens group and a rear converging lens group, said front diverging lens group comprising at least two negative single meniscus lenses and a positive single meniscus lens disposed between said negative meniscus lenses, said rear converging lens group comprising a positive cemented compound lens, a negative meniscus single lens, two positive lenses having a stop disposed therebetween, a negative biconcave lens, and two positive lenses, the improvement which comprises at least one concave surface of said front divergent lens group in the direction toward the stop being nonspHerical for correcting distortion while some of the lenses are of a thickness to provide optical paths of a length to eliminate astigmatism.
 2. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back-Focus B.F. 41.962mm
 3. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back Focus B.F. 41.904mm
 4. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back Focus B.F. 42.255mm
 5. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back-Focus B.F. 41.895mm
 6. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back-focus B.F. 39.497mm
 7. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm RelaTive aperture F/3.5 Angle of view 100* Back-focus B.F. 37.904mm
 8. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back-Focus B.F. 41.878mm
 9. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back-Focus B.F. 42.136mm
 10. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/3.5 Angle of view 100* Back-Focus B.F. 41.834mm
 11. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.5mm Relative aperture F/4.0 Angle of view 100* Back-Focus B.F. 37.986mm
 12. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.5mm Relative aperture F/4 Angle of view 100* Back-Focus B.F. 36.924mm
 13. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.5mm Relative aperture F/4 Angle of view 100* Back-Focus B.F. 37.672mm
 14. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.5mm Relative aperture F/4 Angle of view 100* Back-Focus B.F. 38.622mm
 15. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 15.3mm Relative aperture F/5.6 Angle of view 110* Back-focus B.F. 38.24mm
 16. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 15.3mm Relative aperture F/5.6 Angle of view 110* Back-Focus B.F. 38.33mm
 17. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 15.3mm Relative aperture F/5.6 Angle of view 110* Back-Focus B.F. 38.058mm
 18. A lens system according to claim 1, in which the lens system satisfies the following data: Total focal length f 18.4mm Relative aperture F/5.6 Angle of view 100* Back-Focus B.F. 39.805mm 